Mitsubishi Electric PLA-RP50 Service Manual download pdf (Page 29)

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< Thermistor for lower temperature >

Temperature ()

Resistance (k)

Room temperature thermistor (TH1)

Pipe temperature thermistor/liquid (TH2)

Condenser/evaporator temperature

thermistor (TH5)

Thermistor R0=15k' ± 3%

Fixed number of B=3480 ± 2%

Rt=15exp { 3480( ) }

0: 15k'

10: 9.6k'

20: 6.3k'

25: 5.4k'

30: 4.3k'

40: 3.0k'

Thermistor for

lower temperature

273+t

273

10-6-1. Thermistor

10-6-2. DC Fan motor (FAN MOTOR/INDOOR CONTROLLER BOARD)

Indoor controller board fuse check

Notes

· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.

(It causes trouble of the indoor controller circuit

board and fan motor.)

Self check

Symptom : The indoor fan cannot turn around.





Wiring contact check

Contact of fan motor connector (CNMF)

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

board.

TEST POINT

 : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC 310~340 V

TEST POINT  : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC 15 V

Wiring recovery

Replace the drain pump.

Replace indoor controller board.

Replace the fan motor.

Replace indoor

controller board

Replace the fan motor.

Is the voltage normal?

Is there contact failure?

Yes

Check the operation of fan. END

END

Check the operation

Check method of DC fan motor (fan motor / indoor controller circuit board)

Is the fuse normal?

Yes

Is the resistance

between the terminals of

drain pump normal?

Replace the fan motor.

Replace the indoor controller board.

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Mitsubishi Electric PLA-RP50 Service Manual Page 29

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